利用光固化快速成型及凝胶注模工艺制备电磁带隙晶体

The fabrication of electromagnetic crystals by combining Stereolithography technology and gel-casting process

本研究提出了一种利用光固化快速成型技术及凝胶注模工艺成功制备电磁带隙晶体的工艺路线。根据我们已有的研究,设计电磁带隙晶体的结构是晶格常数为7mm的球形金刚石负型结构。然后,采用光固化快速成型技术制备得到金刚石结构的树脂模型,将氧化铝浆料注入到该树脂模型中,经凝胶固化、冷冻干燥及两次烧结等工艺步骤,最终获得了收缩率为4%的氧化铝陶瓷的电磁带隙晶体。通过扫描电镜观察,经该工艺制备的氧化铝电磁带隙晶体微观形貌较均匀,且空隙较小。电磁波传输特性结果显示,该电磁带隙晶体能够在30.38GHz到39.06GHz波段形成完美带隙。

This study provided a new approach to fabricate electromagnetic band gap crystals by combining Stereolithography (SL) rapid prototyping technology and gel-casting process. According to our previous investigation, the electromagnetic band gap crystals are spherical diamond negative structure. The resin model of the diamond stucture was achieved by adopting the SL technology and was then injected with Al2O3 ceramic slurry. After the cured gelling process, freeze-drying process and twice sintering process, an electromagnetic crystal structure with a shrinkage factor of 4%was finally achieved. The scanning electron microscopic image of the structure showed a well-distributed shape and relatively small gap. The result of the electomagnetic propagation performance indicated that this electromagnetic crystals structure could form a perfect band gap from 30.38GHz to 39.06GHz.